ARTS Microwave Single Scattering Properties Database (Oriented Particles)

The database contains microwave and submillimeter wave single scattering data of azimuthally randomly oriented frozen hydrometeors. Main applications lie in polarized active/passive microwave and submillimeter wave remote sensing. This database is an independent add-on to the ARTS Microwave Single Scattering Properties Database. A description of the simulation methods and database is available in the following article. Please cite it if you use the database for a publication. Brath, M., Ekelund, R., Eriksson, P., Lemke, O., and Buehler, S. A.: Microwave and submillimeter wave scattering of oriented ice particles, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2019-382, in review, 2019. The dataset contains one aggregate habit and one pristine ice crystal habit. Furthermore, 35 frequencies from 1 to 886 GHz, and 3 temperatures, 190, 230 and 270 K, are included. The data were calculated using the discrete dipole approximation method (DDA) in combination with a self developed orientation averaging approach. Interfaces for easy user access is available under a separate upload, due to different licensing, under the title ARTS Microwave Single Scattering Properties Database Interfaces, in which only the Python3 interface can be used for browsing and importing of the single scattering data of azimuthally randomly oriented. The archive InputAzimuthallyRandom.tar.gz contains the shape files, which have be used as input for the DDA simulations. Unpacking The data files for the oriented particles follow the same directory structure as the ARTS Microwave Single Scattering Properties Database. Each tar file contains an SSD directory and the subdirectories for a specific particle orientation. Furthermore, it contains as a quick overview a report of the scattering properties for total random orientation. If the totally randomly oriented particle database is already present, these files should be unpacked in the same location that contains the SSD folder. In Unix, all files can be unpacked with: for ssdfile in SSD-AziRnd-ice*.tar; do
tar -xvf $ssdfile
done

该数据库包含方位角随机取向的冻结水凝物（azimuthally randomly oriented frozen hydrometeors）的微波与亚毫米波单散射数据。其主要应用范畴为极化主动/被动微波及亚毫米波遥感领域。本数据库为ARTS微波单散射特性数据库的独立附加组件。有关模拟方法与数据库的详细说明可参阅下述文献，若将该数据库用于学术发表，请引用此文献：Brath, M., Ekelund, R., Eriksson, P., Lemke, O. 及 Buehler, S. A.: 《定向冰晶粒子的微波与亚毫米波散射》，Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2019-382, 2019年待刊。
本数据集包含一种聚合冰晶形貌与一种纯净冰晶形貌。此外，涵盖1至886 GHz频段内的35个频率点，以及190 K、230 K与270 K共3种温度条件下的散射数据。所有数据均采用离散偶极近似法（Discrete Dipole Approximation, DDA）结合自主开发的取向平均方法计算得到。
鉴于授权协议存在差异，便于用户便捷访问的接口已作为独立上传项发布，标题为《ARTS微波单散射特性数据库接口》，其中仅Python3接口可用于浏览和导入方位角随机取向粒子的单散射数据。
归档文件InputAzimuthallyRandom.tar.gz包含了用于离散偶极近似模拟的输入形状文件。定向粒子的数据文件目录结构与ARTS微波单散射特性数据库保持一致。每个tar文件均包含一个SSD目录以及对应特定粒子取向的子目录。此外，还附带一份用于快速概览的全随机取向粒子散射特性报告。若已部署全随机取向粒子数据库，应将这些文件解压至包含SSD文件夹的同一目录下。在Unix系统中，可通过以下命令批量解压所有文件：
for ssdfile in SSD-AziRnd-ice*.tar; do
tar -xvf $ssdfile
done